[JasonACT]

The fan buttons are on the left in single zone models, they are in the middle for dual zone models. The LCD unit is coded to read the buttons in the particular position for the zone programming, but the button circuit boards are identical.

So, you would have to modify your buttons to include the "middle" fan rocker button if you got the wrong one (which is what I did). So I've got a passenger temp button that does nothing! (Until I re-program my HIM to dual mode and buy the extra components to add in the 2nd AC/Heater mixer unit.. still might do that, except I rarely have a passenger - so it's low priority.)